<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<script type="text/javascript">
var x=0;
var y = 0;
var z = 0;

function add(n){
	n=n+1;
}

var add1 = function(n){
	n=n+100;
}

add(x);
add1(y);

console.log(x);
console.log(y);
</script>
<body>

</body>
</html>